Statement Of Cash Flows [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|
| Statement of cash flows [abstract] | ||
| Cash flows from (used in) operating activities [abstract] | ||
| Cash flows from (used in) operations before changes in working capital |
612,000,000
USD
|
522,000,000
USD
|
| Adjustments for decrease (increase) in trade and other receivables |
6,000,000
USD
|
30,000,000
USD
|
| Adjustments for increase (decrease) in trade and other payables |
43,000,000
USD
|
31,000,000
USD
|
| Cash flows from (used in) investing activities [abstract] | ||
| Purchase of oil and gas assets |
352,000,000
USD
|
454,000,000
USD
|